Alfawise U20: 3D printer with huge build volume

Easy to assemble, large working area, high accuracy - and all this for less than $300


Alfawise U20

The bigger, the better, at least when it comes to 3D printers. Alfawise designers took this assumption to create a 3D printer that is easy to use, can be assembled in several minutes and has unusually large working area that allows printing large objects. Preparing to take the plunge into the wonderful world of 3D printing? Alfawise U20 is perfect entry point.


Speed20 – 150 mm / s
Build volume300 x 300 x 400mm
Frame materialAluminum alloy
Layer size0.1 – 0.4mm
Nozzle diameter0.4 mm
InterfaceChinese, English
OSWindows, Mac, Linux
Voltage24 V
InputsSD card, USB
File formatsG-code, STL
Size39.50 x 57.50 x 61.20 cm
Weight12 kg

Alfawise U20

Pros and Cons


  • Large build volume
  • High precision with a 0.1 mm layer
  • Solid construction
  • Easy to asemble


  •  No WiFi module for cloud printing

Alfawise U20

Printing capabilities

Large build volume of U20 makes it possible to print objects up to 300 x 300 x 400 mm, so you can make huge items in single print. Maximum speed is 150 mm/s, but it’s definitely not recommended, as it will affect the accuracy of layer application. Optimal speed is 50-70mm/s and this is a good compromise between quality and working time. The heatbed heats up to 40-60 degrees Celsius in less than 5 minutes, so you can quickly start it without unnecessary delays.

Regardless of the material you will use – PLA or ABS or even wood filler, you can always expect excellent precision. U20 is able to create layers up to 0.1 mm, which is thin as a single hair. This extreme accuracy allows it to be used for a diverse range of projects, like making architectural objects or modeling machine parts, or creating jewelry or toys. It can also resume printing in case of an unexpected failure or power cut. The power supply itself has an output voltage of 24V and its rated power allows for many hours of work without overheating – remember that printing might take more than 24 hours for bigger stuff. Spool sensor warns when it’s running out of filament and blocks the printing process if necessary. This will save you the frustration and unnecessary loss of material when making bigger items.

Alfawise U20

Assembly and operation

Although the printer is supplied as an DIY kit, the assembly is really simple and even inexperienced makers can handle it, possibly with a little help of numerous Youtube tutorials from community. The assembly consists of just screwing frames, plugging the cables to the appropriate sockets and is clearly demonstrated in the English manual. Manufacturer states that it will take you no more than 5 minutes, although truth be told it’s actually 30 minutes to hour. This includes leveling process that should be done every time you start a new print.

The control is carried out using the Open Source software for Windows, MacOS or Linux PCs connected with USB cable. You can also transfer files to the memory card and do an offline printing thanks to the interface available on the color LCD 2,8’’ display. Its interface allow you to pick files to print and see the current status, warnings from sensors and temperature.

Alfawise U20

Bottom line

Alfawise U20 is simply the best 3D printer with large build below $300. For the bargain price you get high accuracy, reasonably fast working time and LCD display. It looks really futuristic, with a neon red and black aluminum frame and its parts look quite solid, so it will surely serve you well for hundreds of hours. Also assembly is so simple, that even total newbie can get it to work, so it’s easy to recommend it to both pros and hobbyists alike!

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